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1360results about How to "Small attenuation" patented technology

Manufacture method for polarization maintaining fiber and polarization maintaining fiber

The invention provides a manufacture method for polarization maintaining fiber and a polarization maintaining fiber, and relates to optical waveguide fibers in the field of fiber-optical communication and fiber optical sensors. The method comprises the following steps that: (1) two oppositely arranged open slots with a same shape are inwardly provided at a side surface of a glass mother rod, stress rods are machined to obtain a shape matching the open slots, and the centers of the cross sections of the two open slots and the center of circle in the cross section of the glass mother rod are in a same line; (2) the stress rods are respectively inserted into each open slot on the glass mother rod, and the assembled glass mother rod and stress rods are put in a cannula to form a preformed rod of the polarization maintaining fiber; (3) the preformed rod of the polarization maintaining fiber is drew to form the polarization maintaining fiber. According to the invention, the glass mother rod is provided with the open slots, and the stress rods are embedded in the open slots, thereby obtaining high process repeatability; inner surfaces of the open slots have high fineness, and the open slots have good symmetry, thereby improving processing efficiency; therefore, the optical performance and reliability of the polarization maintaining fiber are substantially improved.
Owner:RUIGUANG TELECOMM TECH CO LTD

Power distribution network industrial frequency communicating method and system

The invention relates to a power frequency communication method for a distribution network and a system using the method, firstly, installing a master-slave type communication system which comprises a master station device, a power distribution network and a plurality of user end transceivers, carries modulated information by using weak distortion of waveforms of current and voltage near a zero-crossing point of a power frequency of an electric network, takes the modulated information as part of sine wave of alternating current, takes middle and low voltage distribution network as a medium of information transmission, and uses a mode of half duplex for a both-way communication, so that the master-slave type communication system can penetrate a transformer with power frequency wave with low consumption to achieve a communication over distribution transformers without relaying, has the characteristics of far transmission distance, strong capability of anti-interference, simple device and small investment, and solves the problem that the prior signal of a power line carrier communication is hard to penetrate the distribution transformer to transmit over distribution transformers. The method and the system can be widely used in fields, such as remote meter reading of data of a water meter, an electricity meter and a gas meter, electric power load controlling, electric energy remote collecting, etc.
Owner:CHINA ELECTRIC POWER RES INST +1

Quinoxaline unit containing organic thermally activated delayed fluorescent material and application thereof

The invention relates to a quinoxaline unit containing organic thermally activated delayed fluorescent material and an application thereof. The organic thermally activated delayed fluorescent material, which contains a quinoxaline unit and has good light emitting performance, is obtained through carrying out multiaspect modification by taking quinoxaline with high electrophilicity as a core and constructing different D-A structures by particularly introducing fluorine atoms with high electro-withdrawing power to molecular design for the first time, so that efficient light-emitting elements are obtained, and the thinking of people that conventional fluorescent materials are free of halogens is broken through. The organic thermally activated delayed fluorescent material is simple in synthesis and high in yield and has the advantages of practical large-scale production and application. The [delta]E(S1-T1) of the organic thermally activated delayed fluorescent material is not greater than 0.65eV, so that the organic thermally activated delayed fluorescent material can be applied to the evaporation-coating of devices and can also be applied to the spin-coating of the devices. Electroluminescent elements and luminescent devices with high efficiency, high brightness, low-efficiency attenuation and low trigger voltage are provided through using the novel thermally activated delayed fluorescent material, so that the organic thermally activated delayed fluorescent material can be extensively applied to the field of organic electroluminescence.
Owner:深圳智材有机光电有限公司

Low-attenuation few-mode fiber

The invention relates to a low-attenuation few-mode fiber. The low-attenuation few-mode fiber is that two core layers are provided; three wrapping layers ware arranged at the outsides of the core layers from inside to outside; the relative refractive rate difference delta 1 of the first core layer is 0.30 to 0.42%, and the radius R1 is 5.4 to 8 microns; the relative refractive rate difference delta 2 of the second core layer is 0.20 to 0.25%, and the radius R2 is 10 to 13 microns; the first wrapping layer is an inner wrapping layer which is closely arranged around the core layers, the relative refractive rate difference delta 4 is -0.02 to 0.02%, and the radius R4 is 13.6 to 17 microns; the second wrapping layer is a sunken wrapping layer which is arranged closely around the inner wrapping layers, the relative refractive rate difference delta 5 is -0.8 to 0.4%, and the radius R5 is 17.5 to 30 microns; the third wrapping layer is an outer wrapping layer which is arranged closely around the sunken wrapping layer and is a pure quartz glass layer. The low-attenuation few-mode fiber supports four stable transmission modes under 1550nm, is relatively small in DGD, simple in process, convenient to manufacture, relatively low in attenuation and relatively high in bending resistance.
Owner:SHANTOU HIGH TECH ZONE AOXING OPTICAL COMM EQUIP

High-voltage direct current broadband domain corona current measurement system

The invention provides a high-voltage direct current broadband domain corona current measurement system. The high-voltage direct current broadband domain corona current measurement system comprises a sampling resistance sensor, an extra-high voltage local measurement unit, an optical fiber transmission unit, a safe location measurement unit and an upper computer. The sampling resistance sensor samples the corona current signals of a high-voltage direct current, and converts the corona current signals to voltage signals. The extra-high voltage local measurement unit collects the voltage signals, and optical signals are obtained through photovoltaic conversion. The optical signals are transmitted to the safe location measurement unit through the optical fiber transmission unit. The safe location measurement unit converts the optical signals to the voltage signals. The upper computer processes, stores and displays the voltage signals. The high-voltage direct current broadband domain corona current measurement system has the advantages of being wide in measured frequency range, strong in capability of resisting electromagnetic interference and the like and can have a long-term and stable operation under the environment of extra-high voltage direct current and under the condition of all kinds of bad natural environment conditions, and provides effective technical means for further research of high voltage direct current corona characteristics.
Owner:CHINA ELECTRIC POWER RES INST +2

Extendable embedded type device for fixing and recovering microseismic sensor and method of using same

The invention discloses an extendable embedded type device for fixing and recovering a microseismic sensor and method of using the same. The device comprises three parts of a protective cover, a connecting sleeve, an extendable supporting and fixing structure. The protective cover is composed of a fit cone, a fixing shaft and a cover wall with a mesh. Two ends of the connecting sleeve are respectively provided with internal and external threads. The extendable supporting and fixing structure is composed of a supporting shaft, a connecting ring, a "skeleton", a limit bolt, a limit groove, a supporting pipe, an elastic rod, an elastic cap with a baffle and an elastic shaft. The fit cone at one end of the protective cover is in close contact with coal. A microseismic sensor is located in the protective cover and fixed on the fixing shaft of the protective cover. The other end of the protective cover is connected with one end of the connecting sleeve through the internal thread. The other end of the connecting sleeve is connected with the supporting shaft of the fixing structure through the internal thread. The elastic cap with the baffle is screwed on, the elastic rod is supported tightly, and the supporting pipe is pushed to enable the "skeleton" to open so that the entire device is embedded, supported and fixed into the coal of a drilling hole. In the recovery, the elastic cap is screwed off, the supporting pipe is pulled to enable the "skeleton" structure to close, and the elastic rod, the connecting sleeve, the protective cover and the senor are removed in sequence.
Owner:GUIZHOU INST OF COAL SCI

Prediction method and prediction system of charging current of lithium battery, and charging device

The invention discloses a prediction method and a prediction system of charging current of a lithium battery, and a charging device. The method comprises steps of by taking the minimization of decrement of battery capacity and shortest charging time as objectives, constructing a charging target function; acquiring the real measurement body temperature of a battery and the real measurement environment temperature of a battery service environment in the kth charging period; according to the real measurement body temperature and the real measurement environment temperature, predicting the prediction body temperature of each battery in each charging period between the k+1th charging period and the k+pth charging period, wherein p represents the prediction step lcength of a model prediction control method; and according to the charging target function and each prediction body temperature, using the model prediction control method to predict the optimal charging current in the k+1th chargingperiod where the charging target function is smallest. According to the invention, by charging the lithium battery by use of the predicted optimal charging current, the charging time can be shortened, the charging speed is increased, the decrement of the battery capacity can be reduced and the service lifetime of the battery is prolonged.
Owner:HARBIN UNIV OF SCI & TECH

Device detecting magnetic conduction component defect based on magnetic striction torsion wave

A device to detect defects of magnetic conducting structures based on magnetoconstriction torsional waves belongs to an ultrasonic nondestructive detector, which overcomes shortcomings of high guide wave attenuation of vertical mode and remarkable frequency dispersion effect. During detection, it is unnecessary to process surfaces of the structure. The present invention comprises a pulse signal generator, a power amplifier, a magnetoconstriction torsional wave sensor, a signal preprocessor, an A/D converter and a computer. Wherein, the magnetoconstriction torsional wave sensor is composed of an excitation unit and a receiving unit. The computer controls generation of pulse signals. The pulse signal is amplified by the power amplifier and then generates torsional waves in the structure through the excitation unit. The receiving unit receives the torsional wave from the structure, which is processed by the signal preprocessor and then converted into digital signals by the A/D converter. The computer obtains defect information of the structure. The present invention can conveniently excite and receive torsional waves, detect defects along axis of the structure and adapt to long-distance detection of clad pipes and cables with PE jacket.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Low-attenuation bending insensitive single mode fiber

The invention relates to a low-attenuation bending insensitive single mode fiber which comprises a core layer and wrapping layers. The low-attenuation bending insensitive single mode fiber is characterized in that the relative refractive index difference delta1 of the core layer ranges from 0.30% to 0.38%, the radius R1 of the core layer ranges from 3.5 micrometers to 4.5 micrometers, the four wrapping layers are arranged outside the core layer, the first wrapping layer is a first inner wrapping layer tightly surrounding the core layer, the relative refractive index difference delta2 of the first wrapping layer ranges from -0.02% to 0.02%, the radius R2 of the first wrapping layer ranges from 6.5 micrometers to 8.5 micrometers, the second wrapping layer is a second inner wrapping layer tightly surrounding the first inner wrapping layer, the relative refractive index difference delta3 of the second wrapping layer ranges from -0.02% to 0.02%, the radius R3 of the second wrapping layer ranges from 8 micrometers to 11 micrometers, the third wrapping layer is a downwards-concave wrapping layer tightly surrounding the second inner wrapping layer, the relative refractive index difference delta4 of the third wrapping layer ranges from -0.5% to -0.2%, the radius R4 of the third wrapping layer ranges from 12 micrometers to 20 micrometers, and the fourth wrapping layer is an outer wrapping layer tightly surrounding the downwards-concave wrapping layer and is a pure quartz glass layer. The low-attenuation bending insensitive single mode fiber can be completely matched with a G.652.D optical fiber, and therefore the low attenuation, the large effective area and the bending resistance can be better unified.
Owner:YANGTZE OPTICAL FIBRE & CABLE CO LTD

Improving the detection terminal of the platform area topology identification efficiency and line loss accuracy

The invention discloses a detection terminal for improving the efficiency of station area topology identification and the precision of line loss, comprising a management terminal, a topology identification terminal and a handheld PDA device, wherein, the topology identification terminal is used for acquiring electric energy and topology data of a branch access point and uploading the power and topology data to the management terminal; A handheld PDA device for transmitting binding information between the topology identification terminal and the branch access point to the management terminal; The management terminal is configured to draw a topology map according to the received power and topology data and the binding information between the topology identification terminal and the branch access point. The invention solves the problem of large fluctuation of line loss rate detection in the prior art, In order to improve the efficiency of topology identification and the precision of lineloss, the power frequency communication technology is used to measure, collect, store and transmit the topology information of low voltage distribution, which improves the high quality and high efficiency management of power supply enterprises to customers.
Owner:CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER

Method of fault diagnosis on ball socketed bearing of steel-making converter by comprehensive analysis

The invention discloses a method of fault diagnosis on a ball socketed bearing of a steel-making converter by comprehensive analysis. The method carries out fault diagnosis on the ball socketed bearing of the steel-making converter by using vibration signal analysis and grease oil analysis. The method comprises the following steps of: firstly, selecting evenly distributed measuring points on the periphery of the outer ring of the bearing, and then punching bearing seats at the measuring points; carrying out resonance demodulation and wavelet noise reduction analysis on acquired bearing vibration signals; firstly, selecting centre frequency and bandwidth according to frequency bands generated in resonance peaks in a frequency spectrogram to carry out bandpass filtering, and then carrying out wavelet noise reduction and Hilbert demodulation treatment on the filtered signals; on the basis of detecting the conventional typical properties, carrying out qualitative and quantitative analysis on the components and the content of metal wearers in oil samples by using spectrum analysis and ferrographic analysis, and judging according to the detection result; and comparing and synthesizing two analysis results to make a fault diagnosis report. The invention can effectively increase the accuracy of fault diagnosis, thereby being beneficial to discovering fault hidden troubles as early as possible and avoiding major accidents happening.
Owner:BEIJING UNIV OF TECH
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